Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8d40e1ba9cfa75…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 12:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 587969aefe57912e38a5da417a2ef9ff SHA-1: 7e4e1ffc2afa8a133d7d918adc3e31882692406a SHA-256: 9e8d40e1ba9cfa7598f83da6cbd74ab28f2e1df34c1fd9ebc1e1910aa3cc1dfd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress upload directories. These links likely serve to redirect users to download further malicious payloads, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=telebirr+app+download PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140530d369ba---baxalutamevofogiwiv.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/dodofusutafiw.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/pogimebezuxegaziwizaguba.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/fifosabomoleso.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/tenexobilugaligulolux.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/xubitivow.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0b6c99cb---tivexurase.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/10143689087.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/35593069304.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d410d5f150---puwinemojenatugonubawepu.pdfIn PDF document text
    • http://schokofontaenen.de/idata/93517119071.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/33633096649.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/runotevuwa.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/84289705042.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb50c76e15---97839037954.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/nc61ba0msrds5ln7ne1rm5iua1/litiremavepevax.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/mozisipe.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/pipizu.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210916214300.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/89655107259.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/44475889067.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906022007682953.pdfIn PDF document text
    • https://oasis-travel.ro/files/sufilujodagel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 18052 bytes
SHA-256: f3497427df4dc7e3ba7859a1e741b4545fa3fab8bf9386d0af3159cbd8434401
font_01_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 10308 bytes
SHA-256: fe9406e416c66df5863b92cc538b5cddeb2f79ff30e17f63b7e57733c5141a29

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